Power Balance Band, They help with Strength, Balance. Watch the Power Balance Test . Bands that are available are Medium in Black with White writing , Whites with Black Writing in a Medium. Small bands in stock Black with White writing, Large Black with White writing, Large White with Black writing, No Xtra Large Bands available at this time. Also carry a few Solid Blacks in Medium , and Large. Holograms are Embedded with Frequencies that react positively with your body. FREE SHIPPING FOR BUY IT NOW CUSTOMERS ONLY.